Bobbin chuck

ABSTRACT

A self-aligning bobbin chuck for use with a yarn winding apparatus of the type that includes a drive roll and means for moving a bobbin carried by the chuck into surface driven engagement with the drive roll. The chuck includes concentrically arranged and radially spaced, first and second shafts and a sleeve telescoped over the shafts. The second shaft has a portion that extends beyond one end of the first shaft and is pivotally mounted at a point between its ends to the first shaft for swinging movement in a plane inclusive of the longitudinal axes of both the chuck and the drive roll. The sleeve is rotatably mounted to one end of the second shaft while a damping means is coupled between the other end of the second shaft and the first shaft to dampen out rapidly applied shock loads.

United States Patent 1 1 3,593,932

1 1 lnwmms M y a Virginia/lice 3,160,357 12/1964 Jacksonetal 242/18R Newcastle: 3,272,447 9/1966 Ewingetal 242/46.5 William DavidWalker,Wllmington,b0th 27 71 10/1966 Binfm-d 242 4 2x 3,329,363 7/1967 Smith .1 242 46.5 1 11 p No, 885,855 3,471,095 10/1969 Ewing 242/46.5 1 Wed Dec-17,1969 3,494,565 2 1970 Mullins 242/46.4 1 1 P41991911 Juli/20,1971 3,495,781 2/1970 Grayetal. 242/46.4

[73] Assignee E.l. DuPont de Nemours and Company Wilmington, Del.

[54] BOBBIN CHUCK 6 Claims, 3 Drawing Figs.

18 DD, 46.2, 46.3, 46.4, 46.5, 68, 68.1, 68.2, 6813, 65,66;57/l35 [56] References Cited UNITED STATES PATENTS 3,042,324 7/1962 Kinney 242/18 DD 3,112,082 11/1963 Altice et a1. 242/46.5

Primary Examiner-Stanley N. Gilreath Attorney-Howard P. West, Jr.

ABSTRACT: A self-aligning bobbin chuck for use with a yarn winding apparatus of the type that includes a drive roll and means for moving a bobbin carried by the chuck into surface driven engagement with the drive roll. The chuck includes concentrically arranged and radially spaced, first and second shafts and a sleeve telescoped over the shafts. The second shaft has a portion that extends beyond one end of the first shaft and is pivotally mounted at a point between its ends to the first shaft for swinging movement in a plane inclusive of the longitudinal axes of both the chuck and the drive roll. The sleeve is rotatably mounted to one end of the second shaft while a damping means is coupled between the other end of the second shaft and the first shaft to dampen out rapidly applied shock loads.

INVENTORS MARYLAND VIRGINIA ALTICE WILLIAM DAVID WALKER ATTORNEY PATENIED JUL 20 [WP BY fiwmdv u/uilyv,

BOBBIN CHUCK BACKGROUND OF THE INVENTION This relates to the winding of filamentary materials and more particularly to the chucks used for holding tubular bobbins or yarn package supports.

In chucks used in surface driven windups, attempts have been made to render the chuck self-aligning or, alternatively, to permit some degree of compensatory radial adjustment between bobbin and chuck in an effort to secure parallelism between the bobbin surface (or, as the yarn builds, the yarn surface) relative to a drive roll surface. In the former, elastomeric members have been used where the chuck shaft is mounted in the swing arm and in the latter, various kinds of garter springs, wedge rings, and elastomeric bands have been used between chuck and bobbin inner periphery. While such devices have been somewhat successful, they require that a continuing force be applied to effect and maintain a correction in bobbin alignment relative to the drive roll, thus, the force at one end of a bobbin is invariably greater than at the other, and additional rapidly applied shock loads tend to cause the chuck to vibrate which in turn may result in poor package formation.

SUMMARY OF THE INVENTION The present invention contemplates a damped self-aligning bobbin chuck for use with a yarn winding apparatus that ineludes a drive roll and a swing arm support for moving a bobbin carried by the chuck into surface driven engagement with the roll. The chuck includes a first shaft connected at one of its ends to the support so that this shaft and the drive roll have substantially parallel longitudinal axes. A second shaft which is substantially coaxial with the first is pivotally mounted at a point between its ends to the first shaft for swinging movement in a plane inclusive of the axes. A bobbin support sleeve is rotatably mounted to the second shaft in a manner so that it telescopes over both shafts and a damping means is coupled between the shafts.

In a preferred embodiment the first shaft is hollow and the second shaft is concentric with, radially spaced from and extends out from the hollow portion of the first shaft. The

second shaft is pivotally mounted at a point between its ends to the first shaft for swinging movement in a plane inclusive of longitudinal axes of the chuck and the drive roll. The sleeve or bobbin holder is rotatably mounted to the end of the second shaft that extends outwardly from the first and is telescoped over and radially spaced from the first shaft. At the end opposite from the rotatable sleeve mounting, the second shaft has a damping means coupled between it and the inner wall of the hollow first shaft. In the preferred embodiment a silicone material is confined in a cavity at the end of the second shaft by means of pistons at least two of which are aligned diametrally opposite to each other and act on the inner wall of the first shaft and the second shaft in substantially the abovementioned plane.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a side-elevational view in cross section of a preferred embodiment of a bobbin chuck and a mounting therefor.

FIG. 2 is an end elevational view. of the apparatus of FIG. 1 showing its relation to a surface drive-roll.

FIG. 3 is an enlarged view in cross section of a portion of the apparatus of FIG. 1 that includes the clamping means.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawing, a chuck carrying a bobbin 11 is fixed to a swing arm 14 (shown fragmentarily) and is adapted to move toward and away from a drive-roll 12 in conventional fashion. The chuck 10 includes concentrically arranged and radially spaced first and second shafts 16, 18 respectively and a sleeve 20 telescoped over the shafts. Shaft 18 extends into and is pivotally secured to shaft 16 by means of a close-fitting hinge pin 15, the axis of which is situated substantially perpendicular to a plane 7-7 (FIG. 2) which includes the axis of the shaft 18 and the axis of the shaft of the drive-roll 12. The second shaft 18 carries a spaced pair of ball bearings 13 for the rotatable mounting of sleeve 20.

As best shown in FIG. 3,-a generally T-shaped damping fluid passage 25 is located at the end of shaft 18 and includes a pair of aligned, diametrally opposed bores l7, 19 which do not form a common bore but each of which intersect and are partially open to a third bore 21 which is concentric with the cen tral axis of the shaft 18. The opposed bores 17, 19 are situated in the plane 7-7 and each is occupied by a piston 22, 23, fluid sealing between the bores and respective pistons being effected by means of conventional 0 rings 24. In general, the pistons 22, 23 are each urged radially outward into abutment with the inner wall 16a of the hollow shaft 16 by means of a fluid in the passage 25 and by spring loaded piston 27 urged by spring 26. Piston 27 also has an O-ring :seal 28. A screw 29, ac cessible through the hollow tubular shaft 16, permits axial adjustment of the spring 26 to increase or decrease pressure on the piston 27 and hence on the entrapped fluid in the passage 25.

A pin 31 is tightly fitted in the tubular shaft 16 but passes through a clearance hole 32 in the shaft 18 and is situated parallel to thepin 15. The pin 31 thus serves to hold the assembly together if pin 15 should fail and may serve to limit angular travel of the shaft 18 and its appurtenances if so desired. A bearing 33 situated on the first shaft 16 near support 14 has its outer peripheral surface clear of the interior of sleeve 20. This particular arrangement may be used to limit angular travel of the shaft 18 about pin 15 as well as provide a relatively friction free contact between the sleeve and first shaft when the limit of angular travel is reached.

From the foregoing it will be seen that pivotal movement of shaft 18 about the pin 15 in the plane 7-7 and relative to the hollow tubular shaft 16 is restrained by means of the opposed pistons 22, 23. If for example a force is exerted upward on the free end of the sleeve 20 through bobbin 1] as denoted by arrow 30, the piston 23 will be urged downward exerting pressure on the fluid confined in the passage 25 which, in turn, urges the piston 22 upward in effect, maintaining a taut system, e.g., on without any clearance between the various pistons and their abutting members and without any voids in the fluid in passage 25. Since the bores 17, 19 have small openings into the common bore 21, a damping effect is introduced; however, the damping effect is derived mainly from the choice of fluid used in the passage 25, the most preferred being a non Newtonian silicone polymer of the type described in Organosilicon Compounds" by C. Eaborn, Butterworth Scientific Publications, 1960, which will flow under steady urging but is substantially immovable under a suddenly applied shock load. Thus, in a windup in which an angular misalignment or package taper is present, the concomitant transverse loads on a chuck will result in gradual movement about the pivot 15 until transverse forces are uniform, end to end; however, any rapidly applied shock loads such as those arising from eccentricity from substantially any source (e.g., bearings, housing, bobbin, driveroll or yarn) will be damped out and have substantially no effe ton winding. The preferred silicone polymer is Dow Corning C-2-0982 Coral Bouncing Putty.

In another damping arrangement the bores l7, l9, fed by suitable damping fluid passages may be located in the inboard end of the pivoting shaft so that their axes are parallel to each other, and lie in a plane perpendicular to and are equispaced from the axis of the hinge pin connecting the two shafts. The hinge pin is located in close proximity to the bore openings.

The opposing pistons installed in these bores bear on the out- What we claim is:

l. A bobbin chuck' for use with a yarn winding apparatus that includes a drive-roll and support means for moving a bobbin carried by said chuck into surface driven engagement with said roll, said chuck comprising: a first shaft connected at one of its ends to said support means said shaft and said drive-roll having substantially parallel longitudinal axes; a second shaft substantially coaxial with and pivotally mounted at a point between its ends to said first shaft for swinging movement in a plane inclusive of the axes of the second shaft and said drive roll; a sleeve rotatably mounted to said second shaft, said sleeve telescoped over said shafts; and means coupled between said shafts for damping movement therebetween.

2. A bobbin chuck for use with a yarn winding apparatus that includes a drive-roll and support means for moving a bobbin carried by said chuck into surface driven engagement with said roll, said chuck comprising: a first shaft connected at one of its ends to said support means, said shaft being hollow and having a concentric inner and outer walls, said drive-roll and said shaft having substantially parallel longitudinal axes; a second shaft having one end extending into and its opposite end extending out from said first shaft, said second shaft being concentric with, radially spaced from, and pivotally mounted at a point between its ends to said first shaft for swinging movement in a plane inclusive of said axes; a sleeve rotatably mounted to said opposite end and telescoped over and radially spaced from said opposite end and telescoped over and radially spaced from said first shaft; and means coupled between said one end and the inner wall of said first shaft for damping movement therebetween.

3. The bobbin chuck as defined in claim 2, wherein'said damping means includes diametrally opposed members ex tending radially outwardly from said second shaft against said inner wall and resilient means within said second shaft and contacting said members for urging them outwardly against said inner wall.

4. The bobbin chuck as defined in claim 3 said opposed members extending radially outwardly substantially in said plane.

5. The bobbin chuck as defined in claim 4, said second shaft having a cavity therein, said resilient means being a silicone material confined in said cavity by said members.

6. The bobbin chuck as defined in claim 5, said material being a silicone polymer. 

1. A bobbin chuck for use with a yarn winding apparatus that includes a drive-roll and support means for moving a bobbin carried by said chuck into surface driven engagement with said roll, said chuck comprising: a first shaft connected at one of its ends to said support means said shaft and said drive-roll having substantially parallel longitudinal axes; a second shaft substantially coaxial with and pivotally mounted at a point between its ends to said first shaft for swinging movement in a plane inclusive of the axes of the second shaft and said drive roll; a sleeve rotatably mounted to said second shaft, said sleeve telescoped over said shafts; and means coupled between said shafts for damping movement therebetween.
 2. A bobbin chuck for use with a yarn winding apparatus that includes a drive-roll and support means for moving a bobbin carried by said chuck into surface driven engagement with said roll, said chuck comprising: a first shaft connected at one of its ends to said support means, said shaft being hollow and having a concentric inner and outer walls, said drive-roll and said shaft having substantially parallel longitudinal axes; a second shaft having one end extending into and its opposite end extending out from said first shaft, said second shaft being concentric with, radially spaced from, and pivotally mounted at a point between its ends to said first shaft for swinging movement in a plane inclusive of said axes; a sleeve rotatably mounted to said opposite end and telescoped over and radially spaced from said opposite end and telescoped over and radially spaced from said first shaft; and means coupled between said one end and the inner wall of said first shaft for damping movement therebetween.
 3. The bobbin chuck as defined in claim 2, wherein said damping means includes diametrally opposed members extending radially outwardly from said second shaft against said inner wall and resilient means within said second shaft and contacting said members for urging them outwardly against said inner wall.
 4. The bobbin chuck as defined in claim 3 said opposed members extending radially outwardly substantially in said plane.
 5. The bobbin chuck as defined in claim 4, said second shaft having a cavity therein, said resilient means being a silicone material confined in said cavIty by said members.
 6. The bobbin chuck as defined in claim 5, said material being a silicone polymer. 